After all ships of a given initiative have engaged, all destroyed ships are
removed. Then, continuing in descending order, this process continues
with all ships of the same initiative engaging and then removing all
destroyed ships.

If a player has multiple ships with the same initiative, the player engages
them in any order, engaging one ship before engaging another ship of the
same initiative value.

If multiple players have ships with the same initiative, player order is used
to determine the order. The first player engages all of their ships of a
given initiative before the second player engages all of their ships of that
initiative.